5 638 247 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
2275815875836549137731671	25	80.9	2015-08-31 14:26:15

ECM

Digits	B1	Curves
25	50000	5 / 280

Estimated T-Level: 20.1 ⓘ

TF below 2^62 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)	1998-10-18	Marc Getty / Phil Fizur	1261842F11C10C80	0
Verified (Factored)	2001-05-27	Kate Stange	1261842F11C10C80	3879190

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-12-10	trebor	9F599B572DC71A23	1	1270761	5	3
Verified	2018-04-08	kkmrkkblmbrbk	9F599B572DC71A23	1	3119312	5	3

History

Date	User	Type	Result
2018-04-08	kkmrkkblmbrbk	C-PRP	M5638247/2275815875836549137731671 : 9F599B572DC71A23 PRP: Verified PRP without proof (not generated)
2017-12-10	trebor	C-PRP	M5638247/2275815875836549137731671 : 9F599B572DC71A23 PRP: Verified PRP without proof (not generated)
2015-08-31	Sid & Andy	F-ECM	Factor: 2275815875836549137731671
2015-08-27	snme2pm1	NF	no factor from 2^65 to 2^66
2014-11-17	monst	NF	no factor from 2^64 to 2^65
2014-11-16	Nesowa	NF	no factor from 2^63 to 2^64
2011-01-25	USAFSS	NF-PM1	B1=65000, B2=1121250, E=6
2009-04-13	GrunwalderGIMP	NF	no factor from 2^62 to 2^63